POWERSTEP01 datasheet(30/92 Pages) STMICROELECTRONICS

30 / 92 page

Functional description

powerSTEP01

30/92

DocID025022 Rev 5

GATECFG1 register (Section 11.1.25 on page 63). When the external clock source is

selected, the device continues to work with the integrated oscillator for textosc milliseconds

and then the clock management system switches to the OSCIN input.

Figure 12. OSCIN and OSCOUT pin configuration

Note:

When OSCIN is UNUSED, it should be left floating.

When OSCOUT is UNUSED, it should be left floating.

7.9

Overcurrent detection

The powerSTEP01 measures the load current of each half-bridge sensing the VDS voltage

of the integrated MOSFET (Figure 13). When any of the VDS voltages rise over the

programmed threshold, the OCD flag in the STATUS register is forced low until the event

expires and a GetStatus command is sent to the device (Section 11.1.28 on page 71 and

Section 11.2.20 on page 82). The overcurrent event expires when all the MOSFET VDS

voltages fall below the programmed threshold.

The overcurrent threshold can be programmed by the OCD_TH register in one of 32

available values listed in Table 25 on page 61.

UNUSED

OSCIN

OSCOUT

OSCIN

OSCOUT

OSCIN

OSCOUT

2/4/8/16 MHz

8/16/24/32 MHz

External oscillator

configuration

External clock source

configuration

Internal oscillator

configuration

with clock generation

OSCIN

OSCOUT

Internal oscillator

configuration

without clock source

UNUSED

OSC_SEL = "1xx"

OSC_SEL = "0xx"

EXT_CLK = "0"

EXT_CLK = "1"

AM12830v1

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